Electrochemical methodology to study labile trace metal/natural organic matter complexation at low concentration levels in natural waters
A new electrochemical methodology to study labile trace metal/natural organic matter complexation at low concentration levels in natural waters is presented. This methodology consists of three steps: (i) an estimation of the complex diffusion coefficient (DML), (ii) determination at low pH of the to...
Published in: | Analytica Chimica Acta |
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Elsevier Masson
2013
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Online Access: | http://hdl.handle.net/10400.1/3195 https://doi.org/10.1016/j.aca.2004.05.027 |
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ftunivalgarve:oai:sapientia.ualg.pt:10400.1/3195 2023-05-15T16:02:01+02:00 Electrochemical methodology to study labile trace metal/natural organic matter complexation at low concentration levels in natural waters Domingos, R. F. Benedetti, M. F. Croué, J. P. Pinheiro, J. P. 2013-11-26T16:47:02Z http://hdl.handle.net/10400.1/3195 https://doi.org/10.1016/j.aca.2004.05.027 eng eng Elsevier Masson Domingos, R. F.; Benedetti, M. F.; Croué, J. P.; Pinheiro, J. P. Electrochemical methodology to study labile trace metal/natural organic matter complexation at low concentration levels in natural waters, Analytica Chimica Acta, 521, 1, 77-86, 2004. 0003-2670 AUT: JPI01020; http://hdl.handle.net/10400.1/3195 http://dx.doi.org/10.1016/j.aca.2004.05.027 restrictedAccess Trace metal speciation NOM Complex-diffusion coefficients Modeling Stripping chronopotentiometry Lability article 2013 ftunivalgarve https://doi.org/10.1016/j.aca.2004.05.027 2022-05-30T08:45:30Z A new electrochemical methodology to study labile trace metal/natural organic matter complexation at low concentration levels in natural waters is presented. This methodology consists of three steps: (i) an estimation of the complex diffusion coefficient (DML), (ii) determination at low pH of the total metal concentration initially present in the sample, (iii) a metal titration at the desired pH. The free and bound metal concentrations are determined for each point of the titration and modeled with the non-ideal competitive adsorption (NICA-Donnan) model in order to obtain the binding parameters. In this methodology, it is recommended to determine the hydrodynamic transport parameter, α, for each set of hydrodynamic conditions used in the voltammetric measurements. The methodology was tested using two fractions of natural organic matter (NOM) isolated from the Loire river, namely the hydrophobic organic matter (HPO) and the transphilic organic matter (TPI), and a well characterized fulvic acid (Laurentian fulvic acid, LFA). The complex diffusion coefficients obtained at pH 5 were 0.4 ± 0.2 for Pb and Cu/HPO, 1.8 ± 0.2 for Pb/TPI and (0.612 ± 0.009) × 10−10 m2 s−1 for Pb/LFA. NICA-Donnan parameters for lead binding were obtained for the HPO and TPI fractions. The new lead/LFA results were successfully predicted using parameters derived in our previous work. Article in Journal/Newspaper DML Universidade do Algarve: Sapienta Analytica Chimica Acta 521 1 77 86 |
institution |
Open Polar |
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Universidade do Algarve: Sapienta |
op_collection_id |
ftunivalgarve |
language |
English |
topic |
Trace metal speciation NOM Complex-diffusion coefficients Modeling Stripping chronopotentiometry Lability |
spellingShingle |
Trace metal speciation NOM Complex-diffusion coefficients Modeling Stripping chronopotentiometry Lability Domingos, R. F. Benedetti, M. F. Croué, J. P. Pinheiro, J. P. Electrochemical methodology to study labile trace metal/natural organic matter complexation at low concentration levels in natural waters |
topic_facet |
Trace metal speciation NOM Complex-diffusion coefficients Modeling Stripping chronopotentiometry Lability |
description |
A new electrochemical methodology to study labile trace metal/natural organic matter complexation at low concentration levels in natural waters is presented. This methodology consists of three steps: (i) an estimation of the complex diffusion coefficient (DML), (ii) determination at low pH of the total metal concentration initially present in the sample, (iii) a metal titration at the desired pH. The free and bound metal concentrations are determined for each point of the titration and modeled with the non-ideal competitive adsorption (NICA-Donnan) model in order to obtain the binding parameters. In this methodology, it is recommended to determine the hydrodynamic transport parameter, α, for each set of hydrodynamic conditions used in the voltammetric measurements. The methodology was tested using two fractions of natural organic matter (NOM) isolated from the Loire river, namely the hydrophobic organic matter (HPO) and the transphilic organic matter (TPI), and a well characterized fulvic acid (Laurentian fulvic acid, LFA). The complex diffusion coefficients obtained at pH 5 were 0.4 ± 0.2 for Pb and Cu/HPO, 1.8 ± 0.2 for Pb/TPI and (0.612 ± 0.009) × 10−10 m2 s−1 for Pb/LFA. NICA-Donnan parameters for lead binding were obtained for the HPO and TPI fractions. The new lead/LFA results were successfully predicted using parameters derived in our previous work. |
format |
Article in Journal/Newspaper |
author |
Domingos, R. F. Benedetti, M. F. Croué, J. P. Pinheiro, J. P. |
author_facet |
Domingos, R. F. Benedetti, M. F. Croué, J. P. Pinheiro, J. P. |
author_sort |
Domingos, R. F. |
title |
Electrochemical methodology to study labile trace metal/natural organic matter complexation at low concentration levels in natural waters |
title_short |
Electrochemical methodology to study labile trace metal/natural organic matter complexation at low concentration levels in natural waters |
title_full |
Electrochemical methodology to study labile trace metal/natural organic matter complexation at low concentration levels in natural waters |
title_fullStr |
Electrochemical methodology to study labile trace metal/natural organic matter complexation at low concentration levels in natural waters |
title_full_unstemmed |
Electrochemical methodology to study labile trace metal/natural organic matter complexation at low concentration levels in natural waters |
title_sort |
electrochemical methodology to study labile trace metal/natural organic matter complexation at low concentration levels in natural waters |
publisher |
Elsevier Masson |
publishDate |
2013 |
url |
http://hdl.handle.net/10400.1/3195 https://doi.org/10.1016/j.aca.2004.05.027 |
genre |
DML |
genre_facet |
DML |
op_relation |
Domingos, R. F.; Benedetti, M. F.; Croué, J. P.; Pinheiro, J. P. Electrochemical methodology to study labile trace metal/natural organic matter complexation at low concentration levels in natural waters, Analytica Chimica Acta, 521, 1, 77-86, 2004. 0003-2670 AUT: JPI01020; http://hdl.handle.net/10400.1/3195 http://dx.doi.org/10.1016/j.aca.2004.05.027 |
op_rights |
restrictedAccess |
op_doi |
https://doi.org/10.1016/j.aca.2004.05.027 |
container_title |
Analytica Chimica Acta |
container_volume |
521 |
container_issue |
1 |
container_start_page |
77 |
op_container_end_page |
86 |
_version_ |
1766397661730045952 |